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    <p>But - <b>It is possible with GD and fast!!</b> in comparison with ImageMagick<br><img src="https://i.stack.imgur.com/oqY2S.png" alt="enter image description here"> Create a new image with the size of <i>(2*SourceWidth)/PI</i>.<br> Walk trough each pixel of the new image and find the distance from the center. <i>d<sub>source</sub>=hypot(x-centerX,y-centerY)</i><br> Find the corresponding distance in the source image by <i>d<sub>dest.</sub>=2*r*asin(d<sub>source</sub>/r)/2</i><br> <i>r</i> is the half width of the destination image.<br> See examples with bench mark: <a href="http://meindesign.net/picture2bubble/picture2bubble.php" rel="nofollow noreferrer">http://meindesign.net/picture2bubble/picture2bubble.php</a></p> <pre><code>function fisheye($infilename,$outfilename){ $im=imagecreatefrompng($infilename); $ux=imagesx($im);//Source imgage width(x) $uy=imagesy($im);//Source imgage height(y) $umx=$ux/2;//Source middle $umy=$uy/2; if($ux&gt;$uy)$ow=2*$uy/pi();//Width for the destionation image else $ow=2*$ux/pi(); $out=imagecreatetruecolor($ow+1,$ow+1); $trans=imagecolortransparent($out,ImageColorAllocate($out,0,0,0)); imagefill($im,1,1,$trans); for($c=0;$c&lt;imagecolorstotal($im);$c++){//Copy palette $col=imagecolorsforindex($im,$c); imagecolorset($out,$c,$col[red],$col[green],$col[blue]); } $om=$ow/2;//destination middle for($x=0;$x&lt;=$ow;++$x){//Loop X in destination image for($y=0;$y&lt;=$ow;++$y){//Loop y in destination image $otx=$x-$om;//X in relation to the middle $oty=$y-$om;//Y in relation to the middle $oh=hypot($otx,$oty);//distance $arc=(2*$om*asin($oh/$om))/(2); $factor=$arc/$oh; if($oh&lt;=$om){//if pixle inside radius $color=imagecolorat($im,round($otx*$factor+$umx),round($oty*$factor+$umy)); $r = ($color &gt;&gt; 16) &amp; 0xFF; $g = ($color &gt;&gt; 8) &amp; 0xFF; $b = $color &amp; 0xFF; $temp=imagecolorexact($out, $r, $g, $b); imagesetpixel($out,$x,$y,$temp); } } } imagepng($out,$outfilename); } </code></pre>
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